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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efa38bc978c59fbca6adbdd7d5820bd2932ec413c6ef5a1c4fbd641201b5f1c' 
  AND token = 'sYzJe2zr3dsSqMkOF/PT9LhBXPL3YbIdNjVW3GW5Y7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}